One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,4,6)(3,5,7,8)(9,10,12,14)(11,15,16,13)(17,18)(19,23)(20,24)(21,22)(25,26,29,30)(27,33,34,31)(28,32,37,36)(35,39,40,38)(11,16)(13,15)(17,19,22,20)(18,23,21,24)(26,30)(27,34)(32,36)(35,40)(9,11)(10,13)(12,16)(14,15)(17,20,22,19)(18,23,21,24)(25,26)(27,31)(28,36)(29,30)(32,37)(33,34)(35,39)(38,40)(1,2)(3,5)(4,6)(7,8)(9,11)(10,13)(12,16)(14,15)(17,21,22,18)(19,23,20,24)(25,27,29,34)(26,31,30,33)(28,35,37,40)(32,38,36,39)(1,3,4,7)(2,5,6,8)(9,10)(11,13)(12,14)(15,16)(25,28,29,37)(26,32,30,36)(27,35,34,40)(31,38,33,39)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.